cleavage

 
Pronunciation: /ˈkliːvɪdʒ/

noun

  • 1a sharp division; a split: the old cleavage between the forces of the right and left
  • [mass noun] Biology cell division, especially of a fertilized egg cell: the cell undergoes cleavage and segmentation and develops into a blastula [count noun]: all the cells divide synchronously for the first 12 cleavages
  • [mass noun] the splitting of rocks or crystals in a preferred plane or direction: true slates split easily along a plane of cleavage
  • 2the hollow between a woman’s breasts when supported, especially as exposed by a low-cut garment: Holly and Bridget checked their cleavages and rearranged their hair [mass noun]: she wore a dress that exposed an inch or two of cleavage